Earth is slowing and we need a leap second...
For rotating bodies of mass, they'll slow down if they're more weight on the outside. So...OMG it's all my fault - I knew I shouldn't have had that bag of Cheetos that other day! My bad guys, I'll figure somethin' out...it might require elbow grease and twine...lots of twine...
Historically, time was based on the mean rotation of the earth relative to celestial bodies and the second was defined in this reference frame. However, the invention of atomic clocks defined a much more precise "atomic time" scale and a second that is independent of the earth's rotation. In 1970, an international agreement established two timescales: one based on the rotation of the earth and one based on atomic time. The problem is that the earth's rotation is very gradually slowing down, which necessitates the periodic insertion of a "leap second" into the atomic timescale to keep the two within 1 second of each other.
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